Discussion
Pre-emphasis is applied at the transmitter in order to
Answer: A
Pre-emphasis boosts the treble before modulation, and matching de-emphasis at the receiver restores the balance while attenuating the noise that rose with frequency. The net effect is a useful improvement in signal-to-noise ratio at the top of the band. It raises rather than reduces high-frequency deviation, which is why it must be limited to avoid over-deviation on bright material. Compression is a separate loudness technique. And removing the direct component is unrelated.
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